anyone here running this set-up or anything close... im trying to decide on which set-up i want to
run in my car... right now i have a skunk2 manifold&cam gears,b&m fpr/gauge,aem cai,es oval 2.25piping..
im trying to decide if i should run the ctr pistons&cams with portflow&itr valvetrain,chipped ecu on my motor.
that question i want to know is if anyone is running this set-up, what is compression and any valve clearance problems???
or would it be safer to run this set-up with a b16 head with the same parts above but with the b16 head??? if anyone can help
with info i'd be one happy camper(thanks)...

 

I wouldn't run the CTR's unless you like using 92+ octane booster in every tank. Your effective compression would be around 12.3:1. Or, switch to the B16 head and then do it. Still either way you'll need a higher octane than 92.

Go USDM ITR pistons for a good balance of daily driving, and power.

CTR cams are great (I have them) and they pull way past 9k rpm. Just remember to get springs & retainers if you plan on reving that high.

 

thats just it... the jdm gsr's have the same compression as the us itr pistons... i was also thinking about running the jdm itr pistons or keeping my stock pistons and getting a thinner head gasket... but i think the mugen and/or spoon only raise points up by .2 or .3... so that would still only give me around 10.8 or 10.9... i at least want to get somewhere around 11.1-11.5... and we have 92+ gas where i live...

 

also what will the compression be with jdm itr pistons??? and it should be any valve clearance problems with this set-up in a jdm gsr right???

 

anybody out there....

 

since the GSR CC is smaller than the B16A and B18C5...compression is a little higher...

usdm type r pistons would be about 10.9:1
jdm type r pistons would be about 11.3:1

 

Hi,

I have Toda B Specs and JDM ITR pistons (stock bore). I thought it made the compression a little higher, like 11.4:1? I also have the head milled 20 thousandths, which adds another .2 compression points.

Per 01GSR I would be at 11.5:1, but I thought I was a little higher.

Can anyone confirm compression in B18C1 with JDM ITR pistons?

Thanks,

FB

 

deja vu all over again

i can offer you all those math problems here: http://integra.vtec.net/engine/motorbuild.html

i still think 0.020 raises you more than .2 based on my 0.030 raising me .8 (technically .77) which i stand by. my guess (milling only) raised you .5

(i'll see you and i'll raise you )

 

the only thing i dont like about milling, is the motor can only be milled so many times before it usless...
i guess the best thing to do is if you go that route is to find the right specs to mill it... but im trying to keep it
as lo-cash as possible... im a racer on a tiiite budget, and im trying to get the most out of my motor going the
cheapest(or)lowest way possible... im trying to keep it all oem... and i only really want to road race/auto-x and a
few ***(oops-drag)racing.... plus this is a project so hopefully in the next year it will be finished... if more money comes into
play, then i will get jiggy(hehehe)with this ****...

 

i was giving very rough estimates...notice the ABOUT

there is a web site that give better estimates

 

here's the correct estimates

• Stock B16B CR=10:8
• B16B pistons in B16A CR=11:1ish
• B16B pistons in B17A CR=11.4ish
• B16B pistons in B18C w/GSR head CR=11.8 or more
• B16B pistons in B18C w/ITR or B16A head CR=11.6 or more
• B16B pistons in yo *** CR=15:1...too high !!!
• P73 US pistons in B16A CR=10.4ish
• P73 US pistons in B17A CR=10.6ish
• P73 US pistons in B18C w/GSR head CR=10.8-9ish
• P73 US pistons in B18C w/ITR or B16A head CR=10.6
• P73 JDM pistons in B16A CR=10.6-7ish
• P73 JDM pistons in B17A CR=10.8ish
• P73 JDM pistons in B18C w/GSR head CR=11.3-4ish
• P73 JDM pistons in B18C w/ITR or B16A head CR=11.1

btw: P73 is ITR...


[Modified by 01GSR, 1:24 PM 8/8/2001]

 

yeah i know all about the ff page bro, but i was trying to find the exact comp of the pistons in a gsr motor...
but thanks for you help... and what headgasket would help raise my comp to at least 11.0-1ish?
i know the mugen/spoon only raise by .2/.3 points which would only bring me up to 10.8-9ish

 

Hey Go,

You know I was just regurgitating what I had heard about milling and it's affect on compression ratio. Looks like the JDM ITR pistons raised my compression to approx 11.4:1.

If you think my compression increased by .5, that would be 11.9:1. Wow! Even if it's the .2 I had thought it would be about 11.6:1. I guess to be sure you need to take the motor apart and fill it with liquid or something like that?

Oh well, thanks for the info.

Take care,

FB

 

B16B pistons in B18C w/GSR head CR=11.8 or more

wouldn't that be a GSR motor?